overreactor

And the proper response is to apologize for overreacting, instead of trying to argue that the reaction may have been justified based on the “experiences” of the overreactor.

The Volokh Conspiracy » “Where Are The Women? A precious few were published in recent addition of the UCLA Law Review”:

On reflection, I think I maybe shouldn't have called anybody an "idiot;" maybe simply an overreactor.

From Hunger

Getting people to organize their own defense would be easier if they did not think of the person goading them to it as a chronic overreactor.

Storm Breaking